Replying to 2012 Line Step-Up: 176 or 181? +K for solid advice.

So for a little background, I'm 5'11 and 160 pounds. I'm heavy into the rail game, but lately been working on jumps. As a reference, I've gotten cork and flips down pat. I skied this past year on the 2011 Step-Ups in a 177 and loved them.

As the summer comes around, I've got a hook-up for Lines at about 40%-45% and get new skis about every year. Before you guys get upset that I get new ones every year, realize that:

A. The prices are dirt cheap with the hook-up
B. I'm really hard on skis
C. I work for my skis and do not get them from my parents

So with this in mind, is it wise to move up to the 181? I've skied on the 2010 177 Afterbangs and 2011 177 Step-Ups and loved the size. I'd be doing most of my rail stuff on the Step-Ups. Or would it be a good idea to try the Chronics?

Thanks guys.

*Sparknotes* I'm a Line whore, ski 177s, should I move to 181s? Jump focused.

Oh, and inb4 skatedeck construction sucks. I love the tech and couldn't be convinced otherwise. It's been the only ski tech in the last 4 years that hasn't snapped on me.

+K for help